CN106797274B - The method and apparatus of communication equipment are operated in one or more communication patterns - Google Patents

The method and apparatus of communication equipment are operated in one or more communication patterns Download PDF

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CN106797274B
CN106797274B CN201580023203.5A CN201580023203A CN106797274B CN 106797274 B CN106797274 B CN 106797274B CN 201580023203 A CN201580023203 A CN 201580023203A CN 106797274 B CN106797274 B CN 106797274B
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mcs
sta
mimo
mode
communication pattern
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CN106797274A (en
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X·黄
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Qualcomm Inc
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Qualcomm Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0426—Power distribution
    • H04B7/043—Power distribution using best eigenmode, e.g. beam forming or beam steering
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0452—Multi-user MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0204—Channel estimation of multiple channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0222—Estimation of channel variability, e.g. coherence bandwidth, coherence time, fading frequency
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H04L25/0228—Channel estimation using sounding signals with direct estimation from sounding signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/024—Channel estimation channel estimation algorithms
    • H04L25/0242—Channel estimation channel estimation algorithms using matrix methods
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/04—Speed or phase control by synchronisation signals
    • H04L7/041—Speed or phase control by synchronisation signals using special codes as synchronising signal
    • H04L7/043—Pseudo-noise [PN] codes variable during transmission
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/50—Reducing energy consumption in communication networks in wire-line communication networks, e.g. low power modes or reduced link rate

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Quality & Reliability (AREA)
  • Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

A method of selecting the Modulation and Coding Scheme (MCS) for sending data to client station (STA).The communication equipment predicts MCS first against each communication pattern at least two communication patterns in plurality of communication schemes.Plurality of communication schemes may include at least one of single user multiple-input and multiple-output (SU-MIMO) mode or multi-user's multiple-input and multiple-output (MU-MIMO) mode mode and open loop mode.Then, which is based at least partially on predicted MCS to select one of plurality of communication schemes communication pattern for sending data to STA.

Description

The method and apparatus of communication equipment are operated in one or more communication patterns
Technical field
In summary, the present embodiments relate to wireless communication systems, and specifically, the present embodiments relate to more The method of rate adaptation in user's mimo context.
Background technique
Multiple-input and multiple-output (MIMO) wireless communication technique is used in local area network (LAN) and 4G cellular network, so that Access point (AP) can concomitantly send multiple data flows to client or subscriber station (STA).MIMO communication is logical compared to tradition Letter technology provides lot of advantages comprising such as covering of high capacity, extension, increased diversity and/or AF panel.Therefore, Multiuser MIMO (MU-MIMO) has been revealed as the important feature of next generation wireless network.MU-MIMO, which has, handles MIMO The potentiality that are combined with the benefit of space division multiple access (SDMA) of high capacity.
The MU-MIMO communication technology is described in such as IEEE 802.11ac specification.In brief, from an AP Concomitantly data flow is sent to two or more STA.For example, beam forming can be used for sending first from AP to the first STA Data flow and the essentially identical time from the AP to the 2nd STA send the second data flow.Some AP may include that can use In transmission and/or reception is gone to and the aerial array of the wireless signal from STA.More specifically, by beam forming, AP Energy (for example, data-signal) can be concentrated towards specific STA using mutiple antennas in a multi-user environment.AP is relied on To determine the position of STA and it is thus determined that the direction of the signal is concentrated in channel state information (CSI).But it wirelessly communicates System generally includes the mobile device (for example, cellular phone, tablet device, laptop computer etc.) for often changing position. Therefore, it is desirable that, being based at least partially on the movement of STA to be adapted to its messaging parameter for AP.
Summary of the invention
This general introduction is for some concepts will be described in detailed description below brief form introduction And provide.This general introduction is not intended to identify the key features or essential features of claimed theme, is also not intended to Limit the range of claimed theme.
A method of selecting the Modulation and Coding Scheme (MCS) for sending data to client station (STA).The communication Equipment predicts MCS first against each communication pattern at least two communication patterns in plurality of communication schemes.It is a variety of Communication pattern may include single user multiple-input and multiple-output (SU-MIMO) mode or multi-user's multiple-input and multiple-output (MU-MIMO) At least one of mode mode and open loop mode.Then, which is at least partially based on predicted MCS to select One of plurality of communication schemes communication pattern is used to send data to STA.
For some embodiments, if the MCS predicted for SU-MIMO mode is better than for MU-MIMO mode or opens The MCS that at least one of ring mode mode is predicted, then the communication equipment can choose SU-MIMO mode.In other implementations In example, if the MCS predicted for open loop mode be parity with or superiority in SU-MIMO mode or MU-MIMO mode extremely The MCS that few one mode is predicted, then the communication equipment can choose open loop mode.It, should if above-mentioned condition is all unsatisfactory for Communication equipment can choose MU-MIMO mode.
The communication equipment can predict MCS (for example, by first for SU-MIMO mode and/or MU-MIMO mode It is based at least partially on from the received channel state information of STA and generates stack channel estimation).Channel state information can be sound It should be received in the Empty packet that the communication equipment is broadcasted when probe interval starts.Then, which can determine needle To square singular value of each data tones of stack channel estimation, and square singular value is based at least partially on to calculate letter Road capacity.Finally, the communication equipment can be based at least partially on channel capacity to determine accessible every subcarrier bit Quantity, and the quantity of accessible every subcarrier bit is based at least partially on to select MCS.
The communication equipment can predict MCS (for example, by being based at least partially on first from STA for open loop mode Received channel state information generates stack channel estimation).The equipment can also be by believing circulation delay applied to stack Estimate to calculate equivalent open loop channel in road.Then, which can determine each data tones for equivalent open loop channel Square singular value, and be based at least partially on square singular value to calculate channel capacity.It can be at least finally, calculating equipment Channel capacity is based in part on to determine the quantity of accessible every subcarrier bit, and is based at least partially on accessible The quantity of every subcarrier bit selects MCS.
For some embodiments, which can be based at least partially on the distance between communication equipment and STA Select one of plurality of communication schemes communication pattern.For example, at medium range using beam forming (for example, SU-MIMO and MU-MIMO) may be more efficiently, and at bigger distance using open loop communication may be more effective.Therefore, when When the distance between communication equipment and STA are more than threshold distance, which can choose open loop mode.On the other hand, work as communication When the distance between equipment and STA are less than or equal to threshold distance, which can choose SU-MIMO mode or MU-MIMO mould Formula.
Further, for some embodiments, Doppler's level which can be based at least partially on STA is come Select one of plurality of communication schemes communication pattern.For example, the use of beam forming may be more effective when STA is opposing stationary , and it may be more effective for being communicated when STA is in movement using open loop.The communication equipment can be based at least partially on Determine that the Doppler of STA is horizontal from the received channel state information of STA.More specifically, which can be at least partly Based on the first channel feedback vector is determined from the received channel state information of STA at first time example.The equipment may be used also Second channel feedback vector is determined to be based at least partially at the second time instance from the received channel state information of STA. Then, which can be based at least partially on the difference of the first channel feedback vector sum second channel feedback vector to determine STA Doppler it is horizontal.Therefore, when Doppler's level of STA is more than threshold level, which can choose open loop mould Formula.On the other hand, when Doppler's level of STA is less than or equal to threshold level, which can choose SU-MIMO Mode or MU-MIMO mode.
Operating method permission communication equipment disclosed herein is based at least partially on each in plurality of communication schemes The associated accessible data rate of communication pattern, to select the best mode with STA.For example, can be at least partly Ground is based on optimizing communication pattern for communication channel from the received channel state information of STA.Alternatively and/or furthermore it is possible to It is at least partially based on movement and/or the position of STA, optimizes communication pattern for STA.
Detailed description of the invention
The embodiment of the present invention is illustrated by way of example, and be not intended to be limited to attached drawing these Figure.
Figure 1A shows communication system in accordance with some embodiments.
Figure 1B is the exemplary timing for describing the variation of the Modulation and Coding Scheme (MCS) by the communication system realization of Figure 1A Figure.
Fig. 2A shows another communication system in accordance with some embodiments.
Fig. 2 B is the exemplary timing chart of the variation of the packet error rate (PER) of the communication system of depiction 2A.
Fig. 2 C is to describe showing for the rate adaptation process in accordance with some embodiments that can be realized by the communication system of Fig. 2A Example property timing diagram.
Fig. 3 is to describe determination in accordance with some embodiments for the illustrative of the method for the MCS for being used to communicate with client station Flow chart.
Fig. 4 is the illustrative flow for describing the method for the initial MCS of determination in accordance with some embodiments.
Fig. 5 shows the communication system according to other embodiments.
Fig. 6 is to describe saying for the method in accordance with some embodiments that communication device configured is used for one of multiple communication patterns Bright property flow chart.
Fig. 7 is saying for the method for describing determination in accordance with some embodiments for the MCS that beamformed data are transmitted Bright property flow chart.
Fig. 8 is the illustrative process for describing determination in accordance with some embodiments for the method for the MCS of open loop data transmission Figure.
Fig. 9 shows the block diagram of access point in accordance with some embodiments (AP).
Specific embodiment
In the following description, a large amount of specific details are elaborated, for example, the example of particular elements, circuit and process, to mention For the thorough understanding to present disclosure.Term " coupling " as used in this article, which is meant, to be directly connected or by one or more A component or circuit connection between.In addition, in the following description and for purposes of explanation, giving specific Name, to provide the thorough understanding to the embodiment of the present invention.But it will be apparent to those skilled in the art that, it can The embodiment of the present invention is realized not need these specific details.In other examples, showing well known circuit with block diagram format And equipment, to avoid fuzzy present disclosure.Any signal in signal provided in each bus described herein can be with It is time-multiplexed with other signals, and provided on one or more common bus.Furthermore it is possible to by circuit element or Interconnection between software block is shown as bus or single-signal-line.Each of bus can be alternatively single-signal-line, and single Each of signal wire can be alternatively bus, and single line or bus can be represented for the big of the communication between component Measure physically or logically any one or more of mechanism.The embodiment of present disclosure should not be construed as limited by described herein Specific examples, but by the appended claims limit all embodiments include within its scope.
Figure 1A shows communication system 100 in accordance with some embodiments.Communication system 100 includes access point (AP) 110 He Subscriber station (STA) 120.AP 110 and STA 120 may, for example, be computer, interchanger, router, hub, gateway and/or Similar equipment.For some embodiments, communication system 100 can correspond to multi-user's multiple-input and multiple-output (MU-MIMO) nothing Gauze network (for example, as defined in IEEE 802.11ac specification).Therefore, communication system 100 may include multiple STA and/ Or AP (being not shown in order to simple).
For some embodiments, AP 110 can be by concentrating (for example, as energy beam) in STA 120 data-signal Direction on the communication with STA 120 optimized." detection " technology can be used to determine the phase of STA 120 in AP 110 To position and it is thus determined that the direction that beam forming (BF) signal 101 is directed toward.More specifically, detection is AP 110 logical It crosses it and obtains channel state information (CSI) (for example, instructing sending in the form of Empty packet (NDP) 112 to STA 120 Practice data and/or metadata) process.STA 120 is based at least partially on corresponding training data to calculate feedback vector (V) And feedback vector V is returned into AP 110 in the form of the beam forming frame (CBF) 122 compressed.Then, AP 110, which is used, is somebody's turn to do Feedback vector V generates steering matrix (Q), can be used for carrying out precoding to the data flow being intended to for STA 120.More For body, AP 110 can be used steering matrix Q to generate (or " guidance ") BF signal 101 on the direction in STA 120.
In some embodiments, STA 120 can be the mobile device for moving and/or changing position at any time (for example, bee Cellular telephone, tablet device, laptop computer etc.).For example, although two antennas of STA 120 can be in time t0Place is all It is directly in the range of BF signal 101, but only one antenna is in time t3Place is still within the range of BF signal 101 It is interior.It is towards STA 120 (for example, by regularly (for example, " between detection that AP 101, which can redirect BF signal 101, Every " during) recalculate steering matrix Q).But in order to consider movement that STA 120 is carried out between probe interval, AP 110 can be based at least partially on the performance of present channel to adjust the Modulation and Coding Scheme for sending data to STA 120 (MCS)。
For example, AP 110 can be when probe interval starts (for example, in time t with reference to Figure 1B0Place) it is sent out to STA 120 Send NDP 112 (1).STA 120 is responded using CBF 122 (1), and the CBF122 (1) can be used to determine in AP 110 BF signal 101 is simultaneously directed on the direction of STA 120 by the position of STA 120.More specifically, AP 110 can choose initially MCS (for example, data rate) come start to STA 120 send data (for example, in time t1Place).For some embodiments, AP 110 can be based at least partially on the CSI that is included with CBF 122 (1) to select MCS.However, due to STA's 120 Mobile (and/or movement of other equipment in system 100), the overall throughput and/or effective throughput (example of system 100 Such as, the handling capacity of useful data) deteriorate with the time (for example, from time t0To t3).In order to compensate under effective throughput Drop, AP 110 can be reduced to the MCS or data rate of the transmission of STA 120 (for example, step by step).Therefore, in probe interval At the end of (for example, in time t2Place) MCS that uses can lower than when the probe interval starts (for example, in time t1Place) make MCS.
When starting subsequent probe interval (for example, in time t3Place), AP 110 can send another to STA 120 NDP 112 (2), and receive another CBF 122 (2) in response.At this point, AP 110 can be based at least partially on STA 120 current location generates new BF signal (for example, reboot BF signal 101).For some embodiments, AP 110 can also be based at least partially on the new CSI being included with CBF 122 (2) and/or to one of system performance or Multiple measurements (for example, packet error rate (PER) and/or bit error rate (BER)) adjust MCS.In the case where tradition is realized, AP 110 are based at least partially on across entire probe interval (for example, from time t0To time t3) measurement PER rolling average come Adjust MCS.
Although in time t2Locate the PER of measurement (for example, PER [t2]) can be than in time t1Locate measurement PER (for example, PER[t1]) measurement that updates, but PER [t1] it may be that more accurate system performance indicator (determines new spy by it Survey MCS when interval starts).PER is by channel estimation (for example, whether BF signal 101 is accurately tracked by STA 120) and selected The influence of both MCS (for example, data rate is appropriate for STA 120 and/or channel conditions) selected.Due to PER [t1] anti- Reflected immediately in AP 110 by direction that BF signal 101 is directed to STA 120 (for example, being based at least partially on from STA 120 CSI feedback) after system 100 performance, therefore, channel estimation can have very little to the system performance at the time Or do not influence.On the contrary, any subsequent PER measurement is (for example, in the time>t1Place) it may be by the movement of STA 120 Adverse effect.
For some embodiments, AP 110 is based only upon immediately the PER measured after probe interval previous and at this Between determining CSI, to adjust MCS when each probe interval starts.For example, in time t3Place, AP 110 can at least portions Divide ground based on CBF 122 (2) CSI being included and in time t1Place (or time t0Place) measurement PER, it is new to select MCS to start next probe interval.Once selected new MCS, AP 110 can be based at least partially on when Between the PER measurement that carries out continue to adjust selected MCS, until next probe interval starts.During detection or The each PER measured after detection is hereinafter referred to as " between detection " PER (for example, PERR), and in probe interval Between each PER for measuring be referred to as " in detection " PER (for example, PERA).Similarly, it is based only upon between one or more detections MCS is (for example, MCS between each MCS that PER (for example, and channel state information) is determined hereinafter referred to as is detectedR), and Depending on MCS in each MCS referred to as detection of PER in one or more detect (for example, MCSA).For some embodiments, AP 110 can be based at least partially in same probe interval two or more detect in the average movement of PER select MCS in detecting.
For example, relatively low PER [t1] (for example, be lower than PER thresholding) can indicate corresponding MCS (for example, MCS [t1]) It is very suitable for given communication channel.Therefore, AP 110 can be by selecting higher MCS for subsequent probe intervalR(example Such as, MCS [t3]>MCS[t1]) come to low PERRValue is responded.On the other hand, relatively high PER [t1] (for example, being higher than PER Thresholding) corresponding MCS can be indicated (for example, MCS [t1]) it is poorly suited for given communication channel.Therefore, AP 110 can be with By selecting lower MCS for subsequent probe intervalR(for example, MCS [t3]<MCS[t1]) come to high PERRValue is responded.
Can by the movement as STA 120 and caused by effective throughput loss can be characterized as " Doppler position It moves ".For some embodiments, AP 110 can be based at least partially on the channel feedback that obtains during probe interval to determine The amount and/or degree of the Doppler displacement of STA 120.For example, STA 120 is in the first probe interval due to the movement of STA 120 The feedback vector V returned when beginning may be different from the feedback vector V that STA 120 is returned when next probe interval starts (for example, V [ti]≠V[tj]).Therefore, AP 110 can be based at least partially on the difference from the channel feedback detected every time To calculate Doppler's level (DL) of STA 120.For example, Doppler's level of nx1 feedback vector V can be calculated as：
Wherein, V [ti] and V [tj] indicate by STA 120 in different time example tiAnd tjLocate measurement channel feedback to Amount.
However, two vector V [ti] and V [tj] difference can be without deviating from the scope of this disclosure with each Different modes is planted to calculate (for example, any kind of equation that the distance between point can be related to a value).For example, In V [ti]=[v1(ti),v2(ti),…,vn(ti)] and V [tj]=[v1(tj), v2(tj),…,vn(tj)] in the case where, it is more General Le level can be calculated as：
For some embodiments, the DL value is can be used to further enhance MCS selection course in AP 110.For example, higher DL value can indicate STA 120 carry out largely move.Therefore, for some embodiments, AP 110 can be directed to MCS is adjusted the degree proportional to the DL value by given PER thresholding.For example, AP 110 can usually be solely based on spy Determine PER measurement and MCS is reduced such as 2 times.However, AP 110 now can be at least partly by taking into account high DL value MCS is reduced such as 3 or 4 times based on identical PER measurement by ground.For other embodiments, DL value is can be used in AP 110 Adjust the PER thresholding for the variation that will trigger MCS.With reference to above example, by taking into account high DL value, AP 110 can subtract Small PER thresholding, otherwise the PER thresholding can make MCS be reduced 2 times.DL value can be used for enhancing MCSRAnd/or MCSAThe two Selection.
In addition, DL value is determined for length or the duration of probe interval for some embodiments.For example, low DL value (for example, being lower than lower Doppler thresholds) can indicate that STA 120 is relatively stationary.Therefore, it is more likely that even if Through being still effective by given channel estimation after the plenty of time.Therefore, AP 110 can be by between each detection of increase Every length (for example, passing through detection less frequently) low DL value is responded.On the contrary, high DL value is (for example, be higher than the upper limit Doppler thresholds) can indicate STA 120 carry out high level and/or rate movement, this causes the letter executed by AP 110 The big variation of road estimation.Therefore, in order to more accurately track the movement of STA 120, AP 110 can request relatively frequency from STA 120 Numerous CSI report (for example, length (for example, by relatively frequently detecting) by reducing each probe interval).
In some embodiments, the uplink acknowledgment (ACK) from STA 120 can be based at least partially on to come really Fixed (or increase) DL value.These embodiments are disclosed in such as on September 11st, 2014, entitled " Systems and Methods The U.S. Patent Application Publication No.US20140254648 of for Determining a Channel Variation Metric " In be discussed in more detail, therefore the full content of the patent is merged by reference.
Fig. 2A shows another communication system 200 in accordance with some embodiments.Communication system 200 includes 210 He of AP STA 220.As described above, AP 210 and STA 220 can be for example computer, interchanger, router, hub, gateway and/ Or similar equipment.For some embodiments, communication system 200 can correspond to MU-MIMO wireless network (for example, such as IEEE 802.11ac defined in specification).Therefore, communication system 200 may include that multiple STA and/or AP (do not show in order to simple Out).
For some embodiments, AP 210 can by by data-signal concentrate on the direction of STA 220 come with STA 220 are communicated.As described above, Detection Techniques can be used to periodically determine the position of STA 220 in AP 210, and therefore The direction that each BF signal 201-203 is guided in determination.For example, AP 210 can be in time t0Place is by the first BF signal 201 It is directed on the direction of STA 220.Then, it is based at least partially on the subsequent movement carried out by STA 220, AP 210 can be Time t62nd BF signal 202 is directed on the direction of STA 202 by place, and can also be in time t12Place is by the 3rd BF signal 203 are directed on the direction of STA.Therefore, the CSI feedback that AP 210 can be based at least partially at each probe interval come with The movement of track STA 220, and (and/or rebooting) can be guided to the side of STA 220 corresponding BF signal 201-203 Upwards to improve channel response.
Fig. 2 B is the exemplary timing chart 250 of the variation of the packet error rate of the communication system 200 of depiction 2A.Such as Fig. 2 B Shown in, the data that AP 210 is based at least partially on STA 220 are transmitted to measure a system during each probe interval Arrange PER.More specifically, First Series PER is measured after the first detection event (for example, NDP1) (for example, PER [t0]- PER[t5]), and second series PER is measured (for example, PER [t after the second detection event (for example, NDP2)6]-PER [t11]).First PER in each series is (for example, PER [t0] and PER [t6]) correspond to PER (PER between detectionR), and it is every Remaining PER in a series is (for example, PER [t1]-PER[t5] and PER [t7]-PER[t11]) correspond to PER in detection (PERA)。
PER after detection event is (for example, PERR) can be lower than for any of given probe interval measurement Subsequent PER is (for example, PERA).For example, in time t0Place, STA 220 is in the range of BF signal 201.However, with Time stepping method, STA 220 may further deviate from the optimum beam of BF signal 201 forming direction.Therefore, in time t0Place PERRLower than (for example, indicating less mistake) time t1To t5The PER at placeA.Similarly, in time t6Place, STA 220 are straight It connects and is located in the range of BF signal 202, this makes time t6The PER at placeRRelative to time t5The PER at placeAIt reduces.However, STA 220 gradually move away the optimum beam forming direction of BF signal 202, so that PERAFrom time t7To t1Place increases.Finally, In time t12Place, for STA 220 in the range of BF signal 203, this makes time t12The PER at placeRRelative to the time t11The PER at placeAIt reduces again.
For some embodiments, AP 210 can be based at least partially on PERRAnd/or PERATo adjust data transmission MCS.More specifically, after detection event, AP 210 can be based at least partially on one or more previous PERRValue selects MCS.However, AP 210 can be based at least partially on the PER of the probe interval between probe intervalR And/or one or more PERAValue adjusts selected MCS.
Fig. 2 C is to describe the rate adaptation process in accordance with some embodiments that can be realized by the communication system 200 of Fig. 2A Exemplary timing chart 260.It see, for example Fig. 2 C, AP 210 can choose initial MCS and (come from for example, being based at least partially on The CSI feedback of STA 220) come start to STA 220 send data (t0), it is then based at least partially in time t0To t4Place The PER of measurement adjusts selected MCS.For example, MCS [t1] PER can be depended onR[t0], MCS [t2] can depend on PERR[t0] and PERA[t1] (being averaged), MCS [t3] PER can be depended onR[t0] and PERA[t1]-PERA[t2] (being averaged), MCS[t4] PER can be depended onR[t0] and PERA[t1]-PERA[t3] (being averaged), and MCS [t5] PER can be depended onR [t0] and PERA[t1]-PERA[t4] (being averaged).
Due to immediately in time t6New detection event occurs before, therefore AP 210 can be solely based in time t0 Locate the PER of measurementR(for example, and be based at least partially on the CSI feedback from STA 220) selects new MCS.Then, AP 210 can be based at least partially in time t6To t10Locate the PER value of measurement to adjust new MCS (for example, with institute as above The mode of description).Then, in time t12Place, AP 210 can be based at least partially on PERR[t0] and PERR[t6] be averaged (for example, and be based at least partially on the CSI feedback from STA 220) selects another MCS. MCS[t6] be not dependent on and appoint PER is (for example, PER in what previous detectionA[t1]-PERA[t5]), and MCS [t12] also it is not dependent on any previous detection Interior PER is (for example, PERA[t7]-PERA[t11]).AP 210 can continue by this method, for example, by being based at least partially on Previous PERRThe rolling average of value selects new MCS when each probe interval starts.
Fig. 3 is to describe determination in accordance with some embodiments for the explanation of the method 300 for the MCS for being used to communicate with client station Property flow chart.It see, for example Fig. 2A, method 300 can be realized by AP 210, will be used for configure and/or adjust to STA 220 Send the MCS of data.Specifically, AP 210 determination will can be used to send number to STA 220 during probe interval first According to MCS (310).For example, STA can be based at least partially on CSI received from STA 220, in response to detecting event, come Select specific MCS.For some embodiments, AP 210 can be based at least partially on the road of the prediction for given communication channel Diameter loss will be used to send the initial MCS of data to STA 220 to determine (for example, in more detail below).
Then, AP 210 is determined associated with to the data transmission of STA 220 within the duration that probe interval is surveyed A series of PER (320).For example, referring to Fig. 2 B, AP 210 can measure one after corresponding detection event (for example, NDP1) Series P ER is (for example, PER [t0]-PER[t5]).More specifically, first PER in corresponding sequence is (for example, PER [t0]) right Should between detection PER (PERR), and the remaining PER in the series is (for example, PER [t1]-PER[t5]) correspond to PER in detection (PERA)。
Finally, AP 210 is based at least partially on the first PER in Series P ER, will be used for determine in subsequent probe Interim sends the MCS (330) of data to STA.More specifically, MCS determination can be not dependent on the residue in the series Any MCS in MCS.As described above, PER can be more accurate system performance indicator between detection, needle is determined by it To the best MCS of given communication channel, this is because its most unlikely influenced by any movement of STA (for example, compared to PER in detecting).For example, if PER is relatively low (for example, PER between detectionR<PER thresholding), then AP 210 can choose The higher MCS (for example, associated with higher data rate) compared with MCS between previous detection.On the contrary, if between detection PER is relatively high (for example, PERR>PER thresholding), then AP 210 can choose lower compared with MCS between previous detection MCS (for example, associated with lower data rate).For some embodiments, AP 210 can be based at least partially on more PER's is averaged to determine new MCS between the detection measured in a probe interval.
In addition, Doppler's level that AP 210 can be based at least partially on STA is new to determine for some embodiments MCS.More specifically, DL value, which is determined for AP, reduces and/or increases the degree of MCS (for example, relative to previous spy MCS between survey).For example, if PER is degree high, that AP 210 can be proportional to the DL value by MCS reduction between detection. Therefore, MCS can be reduced into biggish degree for higher DL value, and MCS is reduced into lesser journey for lower DL value Degree.On the contrary, if PER is degree low, that MCS increase can be inversely proportional by AP 210 with the DL value between detection.Therefore, MCS can be increased into lesser extent for higher DL value, and MCS is increased into biggish degree for lower DL value.
Alternatively, DL value, which can be used for adjusting, will trigger the PER thresholding of the corresponding variation of MCS.For example, AP 210 can be with Its sense STA progress more movements, to reduce PER thresholding.Therefore, AP 210 can by PER thresholding and DL value at than Example ground reduces.For example, higher DL value can cause the biggish reduction of PER thresholding.On the contrary, lower DL value can cause PER The less reduction (or increase) of limit.
Fig. 4 is the illustrative flow for describing the method 400 of the initial MCS of determination in accordance with some embodiments.It see, for example Fig. 2A, method 400 can be realized from AP 210 to determine and will be used to send the initial MCS of data (for example, MCS to STA 220 [t0]).Specifically, AP 210 can obtain channel state information (410) from corresponding subscriber station first.For example, AP 210 The NDP comprising training data and/or metadata can be sent to STA 220.STA 220 can use comprising being surveyed by STA 220 The CBF of the CSI (for example, its form that can be feedback vector V) of amount is responded.
Then, AP 210 is based at least partially on the CSI feedback from STA 220 to determine initial MCS estimation (MCS0) (420).For example, AP 210 can be based at least partially on from the received CSI of STA 220 determine AP 210 and STA 220 it Between radio communication channel Signal to Interference plus Noise Ratio (SINR).SINR value can be used for predicting being directed toward at STA 220 The path loss of BF signal.Then, AP 210 can be based at least partially on predicted path loss to configure MCS0.Example Such as, in the case where the path loss of given prediction, MCS0It can be set to the data optimized for the channel of estimation Rate.
AP 210, which is also based at least partially on from the received CSI feedback of STA 220, calculates steering matrix (Q) (430). For example, CSI may include corresponding with compression (for example, simplifying or simplified) expression of channel measured by STA 220 Feedback vector (V).AP 210 generates steering matrix Q using feedback vector V, then steering matrix Q can be used to generate And/or on the corresponding BF signal to the direction of STA 220 of guidance.Due to beam forming main target first is that optimization is given Handling capacity on channel, therefore the PER of the channel should be in its lowest point when BF signal is directly aligned with STA 220.
Therefore, AP 210 can be based at least partially on MCS0Come measure for data transmission PER, to determine whether Reached minimum PER value (PERMin)(440).For some embodiments, PERMinIt can correspond to thresholding PER value (PERTH).Cause This, as long as the PER measured is lower than thresholding PER value (for example, PER<PERTH), then AP 210, which can be determined, has reached minimum PER value.For some embodiments, PERMinIt can correspond to the minimum PER measurement for the set of given steering matrix Q. Therefore, the available multiple PER for multiple and different steering matrix Q of AP 210 are measured, and determine which specific guidance Matrix Q generates minimum PER value.
As long as PER has not been reached yetMin, AP 210 can be based at least partially on current PE R value to adjust steering matrix Q (450), and new steering matrix Q is based at least partially on to obtain new PER measurement (440).If had not been reached yet PERMin, then it is possible that BF signal is not perfectly aligned with STA 220.Therefore, AP 210 can modify steering matrix Q, with BF signal is directed on new direction.For some embodiments, the degree and/or direction that BR signal is guided can be depended on Current PE R value and/or the received CSI of institute.For other embodiments, the degree of guidance and/or direction be might also depend on STA The DL value that 220 movement is characterized (referring to equation 1 above).
Once having reached PERMin, AP 210 can be based at least partially on MCS0Rate adaptation continue (460).More specifically, once AP 210 firmly believes its channel estimation, then can be based at least partially on detection between and PER measurement starts to adjust MCS in detecting0(for example, as above described in Fig. 1-2).Although method 400 aid in determining whether by For the best steering matrix Q of the communication between AP 210 and STA 220, but method 400 may need to expend the time and come in fact It is existing.Therefore, for some embodiments, method 400 can be visited for the purpose for recalibrating MCS at every n-th by AP 210 It surveys at interval (for example, in the case where n=100) and realizes.
Fig. 5 shows the communication system 500 according to other embodiments.Communication system 500 includes AP 510 and multiple STA 522 and 524.As described above, AP 510 and STA 522 and 524 can be for example computer, interchanger, router, hub, Gateway and/or similar equipment.For some embodiments, communication system 500 can correspond to MU-MIMO wireless network (for example, As defined in IEEE 802.11ac specification).According to channel attribute associated with each of STA 522 and 524 and/ Or capacity of equipment, AP 510 can be concomitantly (for example, via multiple encoding channels or subband) or sequentially (for example, via more A time slot) it is communicated with multiple in STA 522 and 524.
For some embodiments, AP 510 can be used orthogonal frequency division multiplexing (OFDM) and be divided into overall system bandwidth Multiple (N) orthogonal subbands (for example, " tone ").Each space channel of each tone can be considered as independent transmission channel, Wherein the bandwidth of composite gain associated with each tone across the tone is effectively constant.In case of the ofdm, often A tone is associated with corresponding subcarrier, which can use data to be modulated.It more specifically, will be each The data sent on tone are modulated (example using the certain modulation schemes for being selected as being used together with the tone first Such as, it is mapped by symbol).
As described above, beam forming technique can be used in AP 510, by the way that multiple concurrent data flows are directed to STA One or more of 522 and/or 524 increase handling capacity.More specifically, in single user multiple-input and multiple-output (SU- MIMO) in mode, AP 510 can sometime concentrated multiple data-signals at a specific STA (for example, STA 522 or STA 524).When operating in multi-user's multiple-input and multiple-output (MU-MIMO) mode, AP 510 can be basic Multiple data-signals are concentrated to one group of STA (for example, both STA 522 and 524) simultaneously.However, AP 510 can also pass through Data (for example, omni-directionally) is sent in the case where not using beam forming, to be operated in open loop mode.
Every kind of communication pattern (for example, SU-MIMO, MU-MIMO and open loop) can in given channel this is specific Optimal different modulating encoding scheme (MCS) is associated for communication pattern.For example, beam forming is usually in medium range (example Such as, 23-30 feet away) in it is most effective.It is beamformed as the distance between AP 510 and STA 522 and/or 524 increase The data rate (for example, MCS) of signal can be close to the data rate of omnidirectional signal.Meanwhile omni-directionally transmission data ratio makes It may much more efficient with beam forming.
Therefore, for some embodiments, AP 510 can predict for each communication pattern (SU-MIMO, MU-MIMO or Open loop) MCS or data rate, and be based at least partially on predicted MCS to select communication pattern (SU-MIMO, MU- MIMO or open loop).For example, if being better than for the MCS that the SU-MIMO between AP 510 and STA 522 is communicated (for example, higher Data rate) combination MCS that is communicated for MU-MIMO between AP 510 and STA 522 and 524, then AP 510 can choose SU-MIMO is as the preferred communication mode with STA 522.On the other hand, if for the open loop between AP 510 and STA 522 The MCS of communication is parity with or superiority over totality MCS associated with any beam forming technique, then AP 510 can choose open loop conduct With the preferred communication mode of STA 522.
Fig. 6 is to describe the method 600 in accordance with some embodiments that communication device configured is used for one of multiple communication patterns Illustrative flow.It see, for example Fig. 5, method 600 can be executed by AP 510 to select with one of STA (for example, STA 522) particular communication mode.Specifically, AP 510 can be first according to each communication pattern in communication pattern come pre- Surveying will be used to send the MCS (610) of data to STA 522.For example, AP 510 can individually predict be used for and STA 522 SU-MIMO communication MCS (for example, as below with reference to described in Fig. 7).AP 510 can also predict will to be used for and conduct The MCS of the MU-MIMO communication of the STA 522 of a part of the group including STA 524 below with reference to Fig. 7 (for example, as retouched It states).AP 510 can also further predict the MCS that will be used to communicate with the open loop of STA 522 (for example, such as below with reference to Fig. 8 It is described).
Then, each of the MCS predicted MCS can be compared by AP 510, so as to select with STA 522 into The AD HOC of row communication.More specifically, AP 510 can choose with highest MCS index (for example, corresponding to the maximum data speed Rate) it is associated, also provide the communication pattern of most effective data transfer mode simultaneously.For example, if being communicated for SU-MIMO The MCS predicted is directed to MU-MIMO and open loop both institutes better than (for example, providing higher data rate in contrast) The MCS (620) of prediction, then AP 510, which can be enabled, communicates (650) with the SU-MIMO of STA 522.On the other hand, if be directed to Open loop communicates predicted MCS and is parity with or superiority over for SU-MIMO the predicted MCS of communication and is parity with or superiority over for MU- MIMO communicates predicted MCS (630), then AP 510, which can be enabled, communicates (660) with the open loop of STA 522.If above Condition is all unsatisfactory for, then AP 510, which can be enabled, communicates (640) with the MU-MIMO of STA 522.
It might also depend on STA using the decision that beam forming (for example, SU-MIMO or MU-MIMO) or open loop communicate 522 position and/or movement (for example, Doppler is horizontal).As described above, beam forming is most effective usually in medium range. Therefore, as STA 522 is further mobile from AP 510, the best MCS of beamformed data signals can be close to open loop data The MCS (for example, it is more effective) of signal.Therefore, it may be preferred that in 522 distance AP of STA for AP 510 510 it is farther when (for example, be more than threshold distance) enable open loop communication, and in STA 522 closer to (for example, in threshold distance) Beam forming is enabled when AP 510.
In addition, as described above, when beam forming is usually directly in the path of beamformed signal in STA 522 It is most effective.However, AP 510 may need to update shifting of the beam forming direction to track STA 522 as STA 522 is mobile It is dynamic.On the contrary, the validity that the movement of STA 522 tends to divided ring communication generates small effect (if any).Therefore, right It may be preferred that being enabled in Doppler's level relatively high (for example, being more than threshold level) of STA 522 for AP 510 Open loop communication, and beam forming is enabled at Doppler's level of STA 522 relatively low (for example, in threshold level).
Fig. 7 is the method 700 for describing determination in accordance with some embodiments for the MCS that beamformed data are transmitted Illustrative flow.See, for example Fig. 5, method 700 can be realized by AP 510 to predict for using SU-MIMO and/or The MCS that MU-MIMO communication pattern carries out data transmission to STA 522 and/or 524.Specifically, AP 510 can first from Each of STA 522 and 524 obtains channel state information (710).As described above, AP 510 can be during detection event The NDP comprising training data and/or metadata is sent to each of STA 522 and 524.STA 522 and 524 can distinguish NDP is responded by sending back CBF, the CBF include by STA measure with compressed format CSI (for example, expression For feedback vector V).
Then, AP 510 is based at least partially on the received feedback vector of institute to generate stack channel estimation (H) (720). In order to generate the H for being directed to MU-MIMO communication (for example, HMU), AP 510 can will be received from each of STA 522 and 524 Feedback vector V be combined to form stack channel matrix HMU.For example, it is assumed that AP 510 has 4 transmitting antennas and STA Each of 522 and 524 only receive a data flow, then for 234 data tones, HMUIt can be 4 × 2 squares Battle array.On the other hand, in order to generate be directed to SU-MIMO communication H (for example, HSU), the feedback from specific STA 522 or 524 to Amount V can be directly translated as stack channel matrix HSU, this is because beam forming is used on a direction.
AP 510 also determines square singular value (SVS) for each of N number of data tones of channel H data tones (730).For example, SVS value can be by channel estimate matrix HMUMatrix factorisation or decomposition obtain.Due to HSUThis It is vector in matter, therefore any matrix decomposition can not be needed.
Then, AP 510 can be based at least partially on the SVS for each of STA 522 and 524 to calculate this The channel capacity (740) of STA.For example, the channel capacity for all N number of tones can be used following equation and calculate (example Such as, for k=1:For N)：
Ck=Ck-1+∑min(log2(1+SNR*SVS(k,:)),u) (2)
Wherein, C0=0, u correspond to the predetermined threshold for being based at least partially on modulation scheme (for example, for 256-QAM For, u=8), SNR represent for specific STA average signal-to-noise ratio and SVS (k,:) represent square surprise for being directed to the STA Different value, and CNIt is the overall channel capacity for all N number of tones.
Finally, AP 510 can be based at least partially on channel capacity to determine accessible every subcarrier bit (BPS) Quantity (750), and the BPS value is converted into specific MCS (760).For example, AP 510 can be by using overall channel Capacity CNAnd BPS is calculated (for example, BPS=C divided by the total N of subcarrier or toneN/N).Then, AP 510 can be such as The BPS value is converted into MCS using inquiry table (for example, the table of MCS relative to BPS).
Fig. 8 is the illustrative of the method 800 for describing determination in accordance with some embodiments for the MCS of open loop data transmission Flow chart.It see, for example Fig. 5, method 800 can be executed by AP 510, with prediction for using open loop communication pattern to STA 522 and/or 524 MCS carried out data transmission.Specifically, AP 510 can be for example, at least based in part on first from STA Each of 522 and 524 CSI feedback, to generate stack channel estimation (H) (810).As described above, referring to Fig. 7, AP 510 can send NDP to each of STA 522 and 524, and receive corresponding feedback vector from each corresponding STA V.Then, AP 510 can by will be combined from the received feedback vector V of each of STA 522 and 524 (for example, For HMU) or directly convert one feedback vector V in STA 522 or 524 (for example, for HSU), to generate Stack channel estimate matrix H.
Then, AP 510 can be based at least partially on spatial spread to calculate equivalent open loop channel (HOL)(820)。 Spatial spread is technology for improving the signal quality of the data communication between AP 510 and STA (for example, by by multiple numbers Even greater amount of transmitting antenna is mapped to according to stream).For example, spatial spread can be by mitigating the institute as caused by multipath fading In received signal frequency spectrum protuberance and it is concave, come improve STA at signal reception.Spatial spread, which can be used, to be caused across day The circulation delay matrix of the cyclic shift of linear array is realized.Therefore, AP 510 can by by circulation delay matrix application in Channel estimate matrix H calculates equivalent open loop channel matrix (HOL)。
AP 510, which is also determined, is directed to open loop channel HOLEach of N number of data tones data tones square singular value (SVS) (830), and the SVS for each of STA 522 and 524 is based at least partially on to calculate the channel of the STA Capacity (840).As described above, SVS value can pass through divided ring channel matrix HOLMatrix factorisation or decomposition obtain.So Afterwards, equation 2 can be used to calculate the channel capacity (C for all N number of tonesN) (for example, as above with respect to described by Fig. 7 ).
Finally, AP 510 can be based at least partially on channel capacity to determine accessible every subcarrier bit (BPS) Quantity (850), and the BPS value is converted into specific MCS (860).For example, AP 510 can be by using overall channel Capacity CNAnd BPS is calculated (for example, BPS=C divided by the total N of subcarrier or toneN/N).Then, AP 510 can be such as The BPS value is converted into MCS using inquiry table (for example, the table of MCS relative to BPS).
Fig. 9 shows the block diagram of access point in accordance with some embodiments (AP) 900.AP 900 includes transceiver 910, processing Device 920 and memory 930.Transceiver 910 can be used for one or more STA, and one or more of the other AP and/or with Other wireless devices appropriate carry out wireless communication.The processor 720 for being coupled to transceiver 910 and memory 930 can be energy Enough execute any of the script of (for example, in memory 930) for storing one or more software programs in AP 900 or instruction Suitable processor.
Memory 930 may include the MCS table 931 for storing MCS index value, and MCS index value can be used for quoting determining logical The various combinations (for example, the quantity of spatial flow, modulation type and code rate) of the messaging parameter of the data rate of letter system.One As for, for given spatial flow quantity and modulation type, higher MCS index value corresponds to higher data rate.It deposits Reservoir 930 can also include non-transitory computer-readable medium (for example, one or more non-volatile memory device, for example, EPROM, EEPROM, flash memory, hard-drive etc.), it can store following software module：
Doppler's sensing module 932 is used to be based at least partially on two or more received channel feedbacks of institute The difference of vector is horizontal (for example, mobile degree) come the Doppler for determining STA；
MCS initialization module 934 is used to be based at least partially on the path loss of the prediction of communication channel to determine The initial MCS of data will be used to send to STA；
MCS adjusts module 936, be used to be based at least partially between one or more detections and/or detect in PER come Adjust the MCS (for example, by selecting new MCS) for sending data to STA；And
Mode selection module 938, be used to be based at least partially on it is being predicted, will be used for according to plurality of communication schemes In each mode send data MCS, AP 900 is configured to one of plurality of communication schemes.
Each software module includes the instruction for making AP 900 execute corresponding function when being executed by processor 920.It deposits Therefore the non-transitory computer-readable medium of reservoir 930 includes for executing the operation above with respect to Fig. 3,4 and 6-8 description In all or part of instruction.
The processor 920 for being shown to be coupled to transceiver 910 and memory 930 in the example of figure 9 can be and can hold The script of (for example, in memory 930) for being stored in row AP 900 one or more software programs or instruction it is any suitable Processor.For example, processor 920 can execute Doppler's sensing module 932, to be based at least partially on two or more The difference of received channel feedback vector determine that the Doppler of STA is horizontal.MCS initialization mould can also be performed in processor 920 Block 934 will be used to send the first of data to STA to be based at least partially on the path loss of prediction of communication channel to determine Beginning MCS.In addition, processor 920 can execute MCS adjustment module 936, to be based at least partially between one or more detections And/or interior PER is detected to adjust the MCS (for example, by selecting new MCS) for sending data to the STA.In addition, processing Device 920 can with execution pattern selecting module 938, be based at least partially on it is being predicted, will be used for according to plurality of communication schemes In each mode send data MCS, AP 900 is configured to one of plurality of communication schemes.
In the foregoing specification, embodiment is described referring to specific example.It will be apparent, however, that can be In the case where not departing from the more broad range such as the present disclosure provided in appended claims, to its various modification can be adapted and Change.For example, the method and step described in the flow chart of Fig. 3,4 and 6-8 can be executed with other suitable order, Duo Gebu Suddenly single step and/or some steps, which can be combined into, can be omitted (or including other steps).Therefore, specification and Attached drawing is considered as with descriptive sense meaning and not restrictive.

Claims (30)

1. a kind of method for operating communication equipment in one of plurality of communication schemes or plurality of communication schemes, the method packet It includes：
When being operated in multi-user's multiple-input and multiple-output (MU-MIMO) mode, determine to be implemented for being sent to station (STA) The first Modulation and Coding Scheme (MCS) of data；
When being operated in single user multiple-input and multiple-output (SU-MIMO) mode, determine to be implemented for being sent to the STA 2nd MCS of data；
When being operated in open loop mode, determine to be implemented for sending the 3rd MCS of data to the STA；
By for the corresponding data rate of each of the first MCS, the 2nd MCS and the 3rd MCS MCS with It is compared for the data rate of other MCS in the first MCS, the 2nd MCS and the 3rd MCS；
Based on the comparison, the MU-MIMO communication pattern, the SU-MIMO communication pattern or open loop communication mould are determined Any communication pattern in formula is associated with the peak data rate in corresponding data rate；And
It is based at least partially in the MU-MIMO communication pattern, the SU-MIMO communication pattern or the open loop communication pattern Any communication pattern it is associated with the peak data rate, select the MU-MIMO communication pattern, the SU-MIMO One of communication pattern or the open loop communication pattern communication pattern are used to send data to the STA.
2. the method for claim 1, wherein the selection includes：
If the data rate for the 2nd MCS is higher than the data rate for the first MCS, select The SU-MIMO mode.
3. the method for claim 1, wherein the selection includes：
If the data rate for the 3rd MCS is equal to or higher than in first MCS of the 2nd MCS or described The data rate of at least one, then select the open loop mode.
4. the method for claim 1, wherein determining that at least one of described first MCS or described, 2nd MCS is wrapped It includes：
It is based at least partially on from the received channel state information of the STA and generates stack channel estimation；
Determine square singular value of each data tones for the stack channel estimation；
Square singular value is based at least partially on to calculate channel capacity；
The channel capacity is based at least partially on to determine the quantity of accessible every subcarrier bit；And
The quantity of the accessible every subcarrier bit is based at least partially on to determine the first MCS or described second MCS。
5. the method for claim 1, wherein determining that the 3rd MCS includes：
It is based at least partially on from the received channel state information of the STA and generates stack channel estimation；
Equivalent open loop channel is calculated by the way that circulation delay is applied to the stack channel estimation；
Determine square singular value of each data tones for the equivalent open loop channel；
Square singular value is based at least partially on to calculate channel capacity；
The channel capacity is based at least partially on to determine the quantity of accessible every subcarrier bit；And
The quantity of the accessible every subcarrier bit is based at least partially on to determine the 3rd MCS.
6. the method for claim 1, wherein the selection includes：
The distance between the communication equipment and the STA are based at least partially on to select the MU-MIMO mode, described One of SU-MIMO mode or the open loop mode mode.
7. method as claimed in claim 6, wherein the selection further includes：
If the distance between the communication equipment and the STA is more than threshold distance, the open loop mode is selected；With And
If the distance between the communication equipment and the STA is less than or equal to the threshold distance, described in selection One of SU-MIMO mode or the MU-MIMO mode mode.
8. the method as described in claim 1 further includes：
It is based at least partially on from the received channel state information of the STA, to determine that the Doppler of the STA is horizontal.
9. method according to claim 8, wherein the selection includes：
Doppler's level of the STA is based at least partially on to select the MU-MIMO mode, the SU-MIMO mould One of formula or the open loop mode mode.
10. method as claimed in claim 9, wherein the selection further includes：
If Doppler's level of the STA is more than threshold level, the open loop mode is selected；And
If Doppler's level of the STA be less than or equal to the threshold level, select the SU-MIMO mode or One of MU-MIMO mode mode.
11. a kind of communication equipment, including：
Memory cell, storage is for selecting the instruction of the Modulation and Coding Scheme (MCS) for sending data to station (STA)； And
One or more processors perform the following operation the communication equipment when executing described instruction：
When being operated in multi-user's multiple-input and multiple-output (MU-MIMO) mode, determine to be implemented for being sent to the STA First MCS of data；
When being operated in single user multiple-input and multiple-output (SU-MIMO) mode, determine to be implemented for being sent to the STA 2nd MCS of data；
When being operated in open loop mode, determine to be implemented for sending the 3rd MCS of data to the STA；
By for the corresponding data rate of each of the first MCS, the 2nd MCS and the 3rd MCS MCS with It is compared for the data rate of other MCS in the first MCS, the 2nd MCS and the 3rd MCS；
Based on the comparison, the MU-MIMO communication pattern, the SU-MIMO communication pattern or open loop communication mould are determined Any communication pattern in formula is associated with the peak data rate in corresponding data rate；And
It is based at least partially in the MU-MIMO communication pattern, the SU-MIMO communication pattern or the open loop communication pattern Any communication pattern it is associated with the peak data rate, select the MU-MIMO communication pattern, the SU-MIMO One of communication pattern or the open loop communication pattern communication pattern are used to send data to the STA.
12. communication equipment as claimed in claim 11, wherein execute described instruction to select in the plurality of communication schemes A kind of communication pattern performs the following operation the equipment：
If the data rate for the 2nd MCS is higher than the data rate for the first MCS, select The SU-MIMO mode.
13. communication equipment as claimed in claim 11, wherein execute described instruction to select in the plurality of communication schemes A kind of communication pattern performs the following operation the equipment：
It is directed in first MCS of the 2nd MCS or described extremely if the data rate for being directed to the 3rd MCS is equal to or higher than The data rate of few one, then select the open loop mode.
14. communication equipment as claimed in claim 11, wherein execute described instruction with determination the first MCS or described the At least one of two MCS perform the following operation the equipment：
It is based at least partially on from the received channel state information of the STA and generates stack channel estimation；
Determine square singular value of each data tones for the stack channel estimation；
Square singular value is based at least partially on to calculate channel capacity；
The channel capacity is based at least partially on to determine the quantity of accessible every subcarrier bit；And
The quantity of the accessible every subcarrier bit is based at least partially on to determine the first MCS or described second MCS。
15. communication equipment as claimed in claim 11, wherein execution described instruction is made described with determination the 3rd MCS Equipment performs the following operation：
It is based at least partially on from the received channel state information of the STA and generates stack channel estimation；
Equivalent open loop channel is calculated by the way that circulation delay is applied to the stack channel estimation；
Determine square singular value of each data tones for the equivalent open loop channel；
Square singular value is based at least partially on to calculate channel capacity；
The channel capacity is based at least partially on to determine the quantity of accessible every subcarrier bit；And
The quantity of the accessible every subcarrier bit is based at least partially on to determine the 3rd MCS.
16. communication equipment as claimed in claim 11, wherein execute described instruction with select the MU-MIMO communication pattern, One of the SU-MIMO communication pattern or the open loop communication pattern communication pattern make the equipment carry out following behaviour Make：
The distance between the communication equipment and the STA are based at least partially on to select the MU-MIMO mode, described One of SU-MIMO mode or the open loop mode mode.
17. communication equipment as claimed in claim 16, wherein execute described instruction with select the MU-MIMO communication pattern, One of the SU-MIMO communication pattern or the open loop communication pattern communication pattern also make the equipment carry out following behaviour Make：
If the distance between the communication equipment and the STA is more than threshold distance, the open loop mode is selected；With And
If the distance between the communication equipment and the STA is less than or equal to the threshold distance, described in selection One of SU-MIMO mode or the MU-MIMO mode mode.
18. communication equipment as claimed in claim 11, wherein execute described instruction and the equipment is also made to carry out following behaviour Make：
It is based at least partially on from the received channel state information of the STA, to determine that the Doppler of the STA is horizontal.
19. communication equipment as claimed in claim 18, wherein execute described instruction with select the MU-MIMO communication pattern, One of the SU-MIMO communication pattern or the open loop communication pattern communication pattern make the equipment carry out following behaviour Make：
Doppler's level of the STA is based at least partially on to select the MU-MIMO mode, the SU-MIMO mould One of formula or the open loop mode mode.
20. communication equipment as claimed in claim 19, wherein execute described instruction with select the MU-MIMO communication pattern, One of the SU-MIMO communication pattern or the open loop communication pattern communication pattern also make the equipment carry out following behaviour Make：
If Doppler's level of the STA is more than threshold level, the open loop mode is selected；And
If Doppler's level of the STA be less than or equal to the threshold level, select the SU-MIMO mode or One of MU-MIMO mode mode.
21. a kind of communication equipment, including：
For when operating in multi-user's multiple-input and multiple-output (MU-MIMO) mode, determining to be implemented be used for station (STA) Send the unit of the first Modulation and Coding Scheme (MCS) of data；
For when operating in single user multiple-input and multiple-output (SU-MIMO) mode, determining to be implemented be used for the STA Send the unit of the 2nd MCS of data；
It is to be implemented for sending the list of the 3rd MCS of data to the STA for determining when being operated in open loop mode Member；
For the corresponding data speed of each of the first MCS, the 2nd MCS and the 3rd MCS MCS will to be directed to Rate is compared with the data rate for other MCS in the first MCS, the 2nd MCS and the 3rd MCS Unit；
For based on the comparison, determining that the MU-MIMO communication pattern, the SU-MIMO communication pattern or the open loop are logical Any communication pattern unit associated with the peak data rate in corresponding data rate in letter mode；And
For being based at least partially on the MU-MIMO communication pattern, the SU-MIMO communication pattern or open loop communication mould Any communication pattern in formula is associated with the peak data rate, selects the MU-MIMO communication pattern, the SU- One of MIMO communication pattern or the open loop communication pattern communication pattern are used to send the unit of data to the STA.
22. communication equipment as claimed in claim 21, wherein described for selecting the MU-MIMO communication pattern, described The unit of one of SU-MIMO communication pattern or the open loop communication pattern communication pattern is used for：
If the data rate for the 2nd MCS is higher than the data rate for the first MCS, select The SU-MIMO mode.
23. communication equipment as claimed in claim 21, wherein described for selecting the MU-MIMO communication pattern, described The unit of one of SU-MIMO communication pattern or the open loop communication pattern communication pattern is used for：
If the data rate for the 3rd MCS is equal to or higher than in first MCS of the 2nd MCS or described The data rate of at least one, then select the open loop mode.
24. communication equipment as claimed in claim 21, wherein described for determining in 2nd MCS of the first MCS or described The unit of at least one be used for：
It is based at least partially on from the received channel state information of the STA and generates stack channel estimation；
Determine square singular value of each data tones for the stack channel estimation；
Square singular value is based at least partially on to calculate channel capacity；
The channel capacity is based at least partially on to determine the quantity of accessible every subcarrier bit；And
The quantity of the accessible every subcarrier bit is based at least partially on to determine the first MCS or described second MCS。
25. communication equipment as claimed in claim 21, wherein described for determining that the unit of the 3rd MCS is used for：
It is based at least partially on from the received channel state information of the STA and generates stack channel estimation；
Equivalent open loop channel is calculated by the way that circulation delay is applied to the stack channel estimation；
Determine square singular value of each data tones for the equivalent open loop channel；
Square singular value is based at least partially on to calculate channel capacity；
The channel capacity is based at least partially on to determine the quantity of accessible every subcarrier bit；And
The quantity of the accessible every subcarrier bit is based at least partially on to determine the 3rd MCS.
26. communication equipment as claimed in claim 21, wherein described for selecting the MU-MIMO communication pattern, described The unit of one of SU-MIMO communication pattern or the open loop communication pattern communication pattern is used for：
The distance between the communication equipment and the STA are based at least partially on to select the MU-MIMO mode, described One of SU-MIMO mode or the open loop mode mode.
27. communication equipment as claimed in claim 26, wherein described for selecting the MU-MIMO communication pattern, described The unit of one of SU-MIMO communication pattern or the open loop communication pattern communication pattern is also used to：
If the distance between the communication equipment and the STA is more than threshold distance, the open loop mode is selected；With And
If the distance between the communication equipment and the STA is less than or equal to the threshold distance, described in selection One of SU-MIMO mode or the MU-MIMO mode mode.
28. communication equipment as claimed in claim 21, further includes：
Determine that the Doppler of the STA is horizontal for being based at least partially on from the received channel state information of the STA Unit；And
The MU-MIMO mode, the SU- are selected for being based at least partially on Doppler's level of the STA The unit of one of MIMO mode or the open loop mode mode.
29. communication equipment as claimed in claim 28, wherein described for being based at least partially on the described more of the STA General Le level selects the unit of one of the MU-MIMO mode, the SU-MIMO mode or open loop mode mode For：
If Doppler's level of the STA is more than threshold level, the open loop mode is selected；And
If Doppler's level of the STA be less than or equal to the threshold level, select the SU-MIMO mode or One of MU-MIMO mode mode.
30. a kind of computer readable storage medium stores computer program, the computer program can be by the processing of communication equipment Device is executed to realize following operation：
When being operated in multi-user's multiple-input and multiple-output (MU-MIMO) mode, determine to be implemented for being sent to station (STA) The first Modulation and Coding Scheme (MCS) of data；
When being operated in single user multiple-input and multiple-output (SU-MIMO) mode, determine to be implemented for being sent to the STA 2nd MCS of data；
When being operated in open loop mode, determine to be implemented for sending the 3rd MCS of data to the STA；
By for the corresponding data rate of each of the first MCS, the 2nd MCS and the 3rd MCS MCS with It is compared for the data rate of other MCS in the first MCS, the 2nd MCS and the 3rd MCS；
Based on the comparison, the MU-MIMO communication pattern, the SU-MIMO communication pattern or open loop communication mould are determined Any communication pattern in formula is associated with the peak data rate in corresponding data rate；And
It is based at least partially in the MU-MIMO communication pattern, the SU-MIMO communication pattern or the open loop communication pattern Any communication pattern it is associated with the peak data rate, select the MU-MIMO communication pattern, the SU-MIMO One of communication pattern or the open loop communication pattern communication pattern are used to send data to the STA.
CN201580023203.5A 2014-05-09 2015-04-24 The method and apparatus of communication equipment are operated in one or more communication patterns Expired - Fee Related CN106797274B (en)

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US14/539,541 US9444576B2 (en) 2014-05-09 2014-11-12 Updates to MU-MIMO rate adaptation algorithm
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